Effect of admission fascia iliaca compartment blocks on post-operative abbreviated mental test scores in elderly fractured neck of femur patients: a retrospective cohort study

Table 3 Multivariable ordinal logistic regression analysis of predictors of post-operative high AMTS, compared with moderate or low AMTS

	Proportional odd ratios	p value	Odd ratio lower bound (95%)	Odds ratio upper bound (95%)
Received admission fascia iliaca compartment block
Yes vs. No	1.80	0.001	1.27	2.54
Admission AMTS
High vs. Low	82.1	<0.001	49.7	135.7
High vs. Moderate	9.8	<0.001	6.0	15.9
Moderate vs. Low	8.4	<0.001	4.9	14.5
Age at event
1 year increment	0.97	0.008	0.95	0.99
5 year increment	0.85	0.008	0.76	0.97
10 year increment	0.72	0.008	0.57	0.92
Source of admission
Residential vs. own home	0.35	0.002	0.18	0.67
Nursing home or hospital vs. own home	0.56	0.04	0.32	0.96
Nursing home or hospital vs. residential	1.60	0.23	0.74	3.43
Comorbities
ASA 3 vs. ASA 1–2	0.89	0.57	0.61	1.32
ASA 4–5 vs. ASA 1–2	0.53	0.06	0.27	1.03
ASA 4–5 vs. ASA 3	0.59	0.11	0.31	1.12
Mode of anesthesia
GA + spinal vs. GA	0.52	0.24	0.17	1.55
Spinal vs. GA	1.39	0.20	0.84	2.29
Spinal vs. GA + spinal	2.70	0.09	0.83	8.8
Time to surgery (log)	0.72	0.05	0.52	1.00

An odds ratio (OR) > 1 represents a higher probability of the primary outcome measure (post-operative AMTS ≥9 versus ≤8) according to the reference category

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